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首页> 外文期刊>Contributions to Mineralogy and Petrology >Supercooled diopside melt: confirmation of temperature-dependent expansivity using container-based dilatometry
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Supercooled diopside melt: confirmation of temperature-dependent expansivity using container-based dilatometry

机译：过冷透辉石熔体：使用基于容器的膨胀法确定温度相关的膨胀性

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摘要

The expansivity of supercooled diopside liquid has been determined using techniques of container-based dilatometry. Two thermal strategies have been employed, one in which the sample is brought to volumetric equilibrium by long-duration dwells at low temperatures (817 deg C) and one in which scanning dilatometry of the sample has been performed at somewhat higher temperatures (890-913 deg C). The results of both experiments yield a supercooled liquid expansivity for diopside liquid in the temperature range of 817-913 deg C of 84.4 +- 2.8 x 10~(-4) cm~3/mol K. The expansivity is 65 percent higher than that obtained for diopside melt obtained at superliquidus temperatures using the double bob Archimedean method. Combined fitting of the new low temperature; volume-temperature data from the present study and the superliquidus data from the literature has been performed. The combined fit yields the following equations for the volume-temperature relationship of diopside liquid (T = temperature in deg C):Specific volume (cm~3/mol K)=31.73+-0.16 x 10~(-2)+59.64+-3.1 x 10~(-6)T-11.23+-1.29 x 10~(-9)T~2Molar volume (cm~3/mol K)=69.40+-0.46+12.40+-0.82 x 10~(-3)T-2.37+-0.34 x 10~(-6)T~2The standard error of the fit using both equations reproduces the volume-temperature data for diopside liquid within experimental error. This result reconciles the disparate values of expansivity measured at low temperatures in the supercooled state and at superliquidus temperatures and confirms the temperature-dependence of the expansivity of diopside liquid. Comparison with previous low temperature estimates of melt volume and expansivity are discussed in light of these new results.
机译：已经使用基于容器的膨胀计技术确定了过冷的透辉石液体的膨胀性。已经采用了两种热学策略，一种是在低温（817℃）下通过长时间的停留使样品达到体积平衡，另一种是在较高温度下对样品进行扫描膨胀分析（890-913）摄氏度）。这两个实验的结果都得出了透辉石液体在817-913摄氏度的温度范围内为84.4 +-2.8 x 10〜（-4）cm〜3 / mol K的过冷液体膨胀率。膨胀率比该温度高65％。使用双鲍勃·阿基米德方法在超液相线温度下获得的透辉石熔体的熔点。新低温组合式安装;来自本研究的体积温度数据和来自文献的超液相线数据已被执行。组合拟合得出了透辉石液体的体积-温度关系的以下方程式（T =以摄氏度为单位的温度）：比体积（cm〜3 / mol K）= 31.73 + -0.16 x 10〜（-2）+59.64+ -3.1 x 10〜（-6）T-11.23 + -1.29 x 10〜（-9）T〜2摩尔体积（cm〜3 / mol K）= 69.40 + -0.46 + 12.40 + -0.82 x 10〜（-3 ）T-2.37 + -0.34 x 10〜（-6）T〜2使用两个方程式拟合的标准误差均再现了透辉石液体在实验误差范围内的体积温度数据。该结果使在过冷状态下和在超液相线温度下在低温下测得的膨胀率的不同值一致，并证实了透辉石液体的膨胀率的温度依赖性。根据这些新结果，讨论了与以前的低温估计的熔体体积和膨胀率的比较。

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